LSI Logic Confidential
Async Master SPARC Error Address Register
10-19
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
DMA Status
[10:8]
DMA status reflects the last master mode access error
caused by the async master DMA as shown below.
Master Timeout Interval
[7:0]
Time-out interval in which to receive a M_DTACK or
M_WAIT acknowledge is specified in units of 1024
internal clocks, with a range of 0 to 255 units.
All fields of this register, except Master Timout Interval, are cleared on a
read through CBus access. Writes to this register is ignored, except for
the Master Timeout Interval field. As a consequence, the only way to
clear the status fields and the MErr fields of this register is to read the
register.
Any software routing that polls the Master Timeout Interval field also
must handle the Error condition, if applicable.
This register is reset to 0.
10.8 Async Master SPARC Error Address Register
This register at control bus address
0x6F01C
contains the address of
the last SPARC write to generates a host error. The upper six bits are
always zero.
Value
Error Type
0
No error.
1
Write to read only chip select.
2
User mode access to supervisor chip select (only for
SPARC accesses).
3
Time-out.
4
Master access with no CS selected.
5
Master access with SD or secondary bitstream DMA
GO bit on and MConfig = 01 or 11.
Содержание DMN-8600
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